# @author Zamith
class Ability
  include CanCan::Ability

  # Defines the permissions for a user wich is not logged in or if it is, 
  # calls the corresponding method to its role
  # @param [Citygate::User] user the current user
  def initialize(user)
    @user = user || Citygate::User.new # guest user (not logged in)
    
    Citygate::Permission.find_all_by_role_id(nil).each do |permission|
      handle_permission permission
    end
    
    if @user.role
      send(@user.role.name.downcase)
    end
  end

  # Defines the permissions on a user with the role of member
  def member
    Citygate::Permission.find_all_by_role_id(1).each do |permission|
      handle_permission permission
    end
  end

  # Defines the permissions on a user with the role of admin, which inherits from member
  def admin
    member
    Citygate::Permission.find_all_by_role_id(2).each do |permission|
      handle_permission permission
    end
  end
  
  protected
  
  def handle_permission(permission)
    if permission.subject_id.nil?
      begin
        can permission.action.to_sym, permission.subject_class.constantize
      rescue
        can permission.action.to_sym, permission.subject_class.to_sym
      end
    else
      begin
        can permission.action.to_sym, permission.subject_class.constantize, :id => permission.subject_id
      rescue
        can permission.action.to_sym, permission.subject_class.to_sym, :id => permission.subject_id
      end
    end
  end

end